/*!	 valuenode_step.cpp
**	 Implementation of the "Step" valuenode conversion.
**
**	Copyright (c) 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "valuenode_step.h"
#include "valuenode_const.h"
#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include <synfig/color.h>
#include <ETL/misc>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Step, RELEASE_VERSION_0_61_08, "step", "Step")

ValueNode_Step::ValueNode_Step(const ValueBase &value):
    LinkableValueNode(value.get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    set_link("duration",     ValueNode_Const::create(Time(1)));
    set_link("start_time",   ValueNode_Const::create(Time(0)));
    set_link("intersection", ValueNode_Const::create(Real(0.5)));

    Type &type(get_type());

    if (type == type_angle) {
        set_link("link", ValueNode_Const::create(value.get(Angle())));
    } else if (type == type_color) {
        set_link("link", ValueNode_Const::create(value.get(Color())));
    } else if (type == type_integer) {
        set_link("link", ValueNode_Const::create(value.get(int())));
    } else if (type == type_real) {
        set_link("link", ValueNode_Const::create(value.get(Real())));
    } else if (type == type_time) {
        set_link("link", ValueNode_Const::create(value.get(Time())));
    } else if (type == type_vector) {
        set_link("link", ValueNode_Const::create(value.get(Vector())));
    } else {
        throw Exception::BadType(get_type().description.local_name);
    }
}

LinkableValueNode*
ValueNode_Step::create_new()const
{
    return new ValueNode_Step(get_type());
}

ValueNode_Step*
ValueNode_Step::create(const ValueBase &x)
{
    return new ValueNode_Step(x);
}

ValueNode_Step::~ValueNode_Step()
{
    unlink_all();
}

ValueBase
ValueNode_Step::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    Time duration((*duration_)(t).get(Time()));
    Time start_time((*start_time_)(t).get(Time()));
    Real intersection((*intersection_)(t).get(Real()));

    t = (floor((t - start_time) / duration) + intersection) * duration + start_time;

    Type &type(get_type());

    if (type == type_angle) {
        return (*link_)(t).get(Angle());
    }

    if (type == type_color) {
        return (*link_)(t).get(Color());
    }

    if (type == type_integer) {
        return (*link_)(t).get(int());
    }

    if (type == type_real) {
        return (*link_)(t).get(Real());
    }

    if (type == type_time) {
        return (*link_)(t).get(Time());
    }

    if (type == type_vector) {
        return (*link_)(t).get(Vector());
    }

    assert(0);
    return ValueBase();
}

bool
ValueNode_Step::check_type(Type &type)
{
    return
        type == type_angle	||
        type == type_color	||
        type == type_integer	||
        type == type_real		||
        type == type_time		||
        type == type_vector	;
}

bool
ValueNode_Step::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(link_,         get_type());

    case 1:
        CHECK_TYPE_AND_SET_VALUE(duration_,     type_time);

    case 2:
        CHECK_TYPE_AND_SET_VALUE(start_time_,   type_time);

    case 3:
        CHECK_TYPE_AND_SET_VALUE(intersection_, type_real);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Step::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        return link_;

    case 1:
        return duration_;

    case 2:
        return start_time_;

    case 3:
        return intersection_;

    default:
        return 0;
    }
}

LinkableValueNode::Vocab
ValueNode_Step::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "link")
                  .set_local_name(_("Link"))
                  .set_description(_("The value node used to make the step"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "duration")
                  .set_local_name(_("Duration"))
                  .set_description(_("The duration of the step"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "start_time")
                  .set_local_name(_("Start Time"))
                  .set_description(_("The time when the step conversion starts"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "intersection")
                  .set_local_name(_("Intersection"))
                  .set_description(_("Value that define whether the step is centered on the value [0,1]"))
                 );

    return ret;
}